Right at the beginning of Stage 6, Killabilly will be throwing cars at you from afar. In order to cross the gap in front of you, you must create a bridge for yourself using the cars he's throwing at you. To do so, stand in front of a car's projectile path, and press Triangle Button at the correct time to knock it back and deflect it. For this trophy you must create both bridges without failing and without any cars hitting you throughout this section. It is perfectly fine to avoid the cars but if a car is coming towards you and you get hit, it will void the trophy forcing you to restart.

The trophy wont unlock immediately after you created both bridges, though. Proceed through the stage until you reach the alleyway to earn it.